Bicycle frame



FIG. 1 is a side elevational view of a bicycle frame showing my newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is a front elevational view thereof.

The broken lines in FIG. 1 are for illustrative purposes only.

The ornamental design for a bicycle frame, substantially as shown anddescribed.